Question

A book seller gains 30% on the cost price by selling a book for $130.Calculate the cost price of the book.​

Answer 1

Let the cost price be x

• Selling price, S.P. = 130
• Gain % = 30%

`\rm{C.P. = (S.P. * 100)/(100+ gain \% )}`

`\rm{C.P. = (130 * 100)/(100+30)}`

`\rm{ C.P. = (130)/(30) }`

`\large{\boxed{\rm{ C.P. = (13)/(3)}}}`